CN210745034U

CN210745034U - IGBT half-bridge inverter power supply adopting frequency tracking technology

Info

Publication number: CN210745034U
Application number: CN201921898170.0U
Authority: CN
Inventors: 李华兴
Original assignee: Shenzhen City Avic Bit Communication Technology Co ltd
Current assignee: Shenzhen AVIC bit Communication Technology Co.,Ltd.
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-06-12
Anticipated expiration: 2029-11-06

Abstract

The utility model belongs to the technical field of the invertion power supply among the active plasma lightning protection system and an adopt IGBT half-bridge invertion power supply of frequency tracking technique is disclosed, IGBT's drive generally all realizes through dedicated drive collection moulding piece, as long as select suitable parameter can. The negative voltage generated by the driving module turns off the IGBT to reduce the current tail time. And the general drive module integrates the overcurrent protection and alarm functions of the device. The front end of the driving module is a core-PWM control circuit of the main control circuit. The half-bridge inverter mainly comprises a control chip special for a half bridge, wherein the chip generates 2 paths of inverse PWM signals with controllable dead zones and controls two IGBTs to be conducted in turn. The chip can adjust the frequency and the duty ratio of the output PWM signal through the resistor. And the device also has a synchronization function (the output frequency is controlled by an external signal), so that the discharge frequency can be controlled. The chip also has a shoot down function, and when the protection circuit detects that a fault exists, the chip can be turned off to realize the turning off of the rear-stage resonant circuit.

Description

IGBT half-bridge inverter power supply adopting frequency tracking technology

Technical Field

The utility model relates to an inverter power supply technical field among the active plasma lightning protection system especially relates to an adopt IGBT half-bridge inverter power supply of frequency tracking technique.

Background

In most occasions with medium power, the inverter power supply main power conversion adopts a half-bridge topological structure, and a control circuit of the structure is relatively simple. Through the conversion of a half-bridge circuit, the output is a square wave with the peak voltage of 360V, a main power device is composed of an IGBT module, compared with a power MOS tube, the power MOS tube has large current, voltage and power capacities, the defect is that a driving circuit is complex, and a user needs to read the current value on a front panel to identify whether a load works in a resonant frequency range or not through manual tuning.

In the traditional inverter, a user can adjust the output frequency of the inverter by rotating a tuning knob on a front panel of the inverter, the user pays attention to the reading of an ammeter while rotating, turning and rotating the inverter, and when the reading is the maximum, the user indicates that a load works at a resonant frequency point.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the existing defect is overcome, provide an IGBT half-bridge inverter power supply adopting frequency tracking technology, through output current zero passage detection, control PWM with current zero passage signal through hardware circuit or singlechip, just so can be fine realize IGBT zero current turn-off and automatic frequency tracking, and when circuit parameter changes, circuit power factor and generator discharge power can only change a little; the automatic frequency tracking can well identify whether the load works in a resonant frequency range, can ensure that the load works in the optimal resonant frequency, and can also identify the working mode of the circuit, if the circuit works in an inductive mode, the loss of the IGBT is greatly higher than that of a capacitive mode, and the problems in the background art can be effectively solved.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model provides an adopt IGBT half-bridge invertion power supply of frequency tracking technique, include:

an inverter power supply;

the output end of the inverter power supply is connected with the fuse and rectified into half-string waves through a rectifier bridge;

a diode connected to the fuse;

the starting-up slow starting circuit is connected to the first filter capacitor and filters the half-chord wave into smooth direct current VBUS, the VBUS is connected with a main power converter of a half-bridge topology, and the output Vo is a high-frequency square wave and is connected with the primary of a high-frequency high-voltage transformer;

the second filter capacitor and the third filter capacitor are connected with the first filter capacitor in parallel;

the auxiliary power supply unit converts 220Vac into a plurality of paths of direct current power supplies for output by using an AC-DC module;

an IGBT driving unit driving the IGBT module using two IGBT driving ICs;

and the SG2525 is used as a main control PWM IC by the main control unit, two paths of symmetrical PWM signals with dead zones are generated, and the control of the IGBT driving unit of the half-bridge circuit and the adjustment of the PWM signal frequency through the MCU are realized by combining a digital circuit and other control and feedback signals.

As a preferred technical solution of the present invention, the inverter input is 220 Vac.

As a preferred technical proposal of the utility model, the startup slow starting circuit comprises a surge current suppression resistor and a relay,

wherein the surge current suppression resistor is connected in parallel with the relay.

As an optimized technical solution of the present invention, the main power converter is a half-bridge topology, and the SG2525 is used as a main control unit to realize the output and tracking of the PWM control signal.

As an optimized technical scheme of the utility model, multichannel DC power supply output is +15V, -15V, +5V, 3.3V respectively.

As a preferred technical scheme of the utility model, two IGBT drive IC are VLA 502-01R.

The utility model discloses in the one or more technical scheme that provides, following technological effect or advantage have at least:

through output current zero-crossing detection, a current zero-crossing signal controls PWM through a hardware circuit or a single chip microcomputer, so that IGBT zero-current turn-off and automatic frequency tracking can be well realized, and when circuit parameters change, the circuit power factor and the generator discharge power only slightly change; the automatic frequency tracking can well identify whether the load works in a resonant frequency range, can ensure that the load works in an optimal resonant frequency, and can also identify the working mode of the circuit, and if the circuit works in an inductive mode, the loss of the IGBT is greatly higher than that of a capacitive mode.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.

In the drawings.

Fig. 1 is a schematic diagram of an IGBT half-bridge inverter power circuit employing frequency tracking technology according to an embodiment of the present invention.

Fig. 2 is a logic block diagram of an IGBT half-bridge inverter power supply adopting a frequency tracking technology according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of an IGBT driving unit on the upper part of an IGBT half-bridge inverter power supply adopting a frequency tracking technology according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a main control unit on an upper portion of an IGBT half-bridge inverter power supply adopting a frequency tracking technology according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

For better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the present invention.

Example (b):

please refer to fig. 1-4, the utility model relates to an adopt IGBT half-bridge inverter power supply of frequency tracking technology, inverter power supply 1 input is 220Vac, through fuse 2, again through rectifier bridge 4 rectification for half-chord wave, through the start slow start circuit (by surge current suppression resistance 5 and relay 6 parallel connection), receive first filter capacitor 7, filter half-chord wave for smooth direct current VBUS, VBUS connects half-bridge topological main power converter 10, output Vo is high frequency square wave 11, connect the elementary of high frequency high voltage transformer, the main power topology is symmetrical half-bridge circuit, adopt SG2525 to make the master control unit realize PWM control signal's output, and track.

As shown in fig. 2, the inverter 1 converts 220VAC into a frequency-adjustable high-frequency square wave to be applied to a load, which is a series resonant DBD generator. The whole inverter power supply 1 comprises a main power unit, an auxiliary power unit 12, a main control unit 14 and an IGBT driving unit 13;

the main power unit inverts the input of 220Vac into high-frequency square waves, and the main power converter 10 is in a half-bridge topological structure;

an auxiliary power supply unit 12, which uses an AC-DC module to convert 220Vac into multiple DC power outputs, which are +15V, -15V, +5V, and 3.3V, respectively, to supply power to other units;

the main control unit 14 uses SG2525 as a main control PWM IC to generate two paths of symmetrical PWM signals with dead zones, and combines a digital circuit and other control and feedback signals to control the IGBT driver of the half-bridge circuit and adjust the frequency of the PWM signals through the MCU, and uses a load to operate at a resonant frequency;

the IGBT driving unit 13 drives the IGBT module by using two special IGBT driving ICs (VLA 502-01R) and has an overcurrent protection function.

The inverter power supply 1 converts 220VAC into a frequency-adjustable high-frequency square wave to a load, the circuit structure is that main power conversion adopts a half-bridge topological structure, the output is the square wave with the peak voltage of 360V through the conversion of a half-bridge circuit, a main power device is formed by an IGBT module, and compared with a power MOS tube, the current, voltage and power capacity of the power MOS tube is large;

the driving of the IGBT is generally realized by a dedicated driving integrated module, as long as appropriate parameters are selected. The negative voltage generated by the driving module turns off the IGBT to reduce the current tail time. And the general drive module integrates the overcurrent protection and alarm functions of the device.

The front end of the driving module is a core-PWM control circuit of the main control circuit. The half-bridge inverter mainly comprises a control chip special for a half bridge, wherein the chip generates 2 paths of inverse PWM signals with controllable dead zones and controls two IGBTs to be conducted in turn. The chip can adjust the frequency and the duty ratio of the output PWM signal through the resistor. And the device also has a synchronization function (the output frequency is controlled by an external signal), so that the discharge frequency can be controlled. The chip also has a shoot down function, and when the protection circuit detects that a fault exists, the chip can be turned off to realize the turning off of the rear-stage resonant circuit.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides an adopt IGBT half-bridge inverter power supply of frequency tracking technique which characterized in that: the method comprises the following steps:

an inverter power supply (1);

the output end of the inverter power supply (1) is connected with the fuse (2) and rectified into a half-sine wave through a rectifier bridge (4);

a diode (3), the diode (3) being connected to the fuse (2);

the starting-up slow starting circuit is connected to a first filter capacitor (7) and filters the half-chord wave into smooth direct current VBUS, the VBUS is connected with a main power converter (10) of a half-bridge topology, and the output Vo is a high-frequency square wave (11) and is connected with the primary of a high-frequency high-voltage transformer;

a second filter capacitor (8) and a third filter capacitor (9), the second filter capacitor (8) and the third filter capacitor (9) being connected in parallel with the first filter capacitor (7);

an auxiliary power supply unit (12) for converting 220Vac into a plurality of direct current power outputs using one AC-DC module;

an IGBT drive unit (13), the IGBT drive unit (13) driving an IGBT module using two IGBT drive ICs;

and the main control unit (14) uses SG2525 as a main control PWM IC, generates two paths of symmetrical PWM signals with dead zones, and realizes the control of the IGBT driving unit (13) of the half-bridge circuit by combining a digital circuit and adjusts the frequency of the PWM signals through an MCU.

2. The IGBT half-bridge inverter power supply adopting the frequency tracking technology as claimed in claim 1, wherein: the input of the inverter power supply (1) is 220 Vac.

3. The IGBT half-bridge inverter power supply adopting the frequency tracking technology according to claim 2, wherein: the startup slow starting circuit comprises a surge current suppression resistor (5) and a relay (6),

wherein the surge current suppression resistor (5) is connected in parallel with the relay (6).

4. The IGBT half-bridge inverter power supply adopting the frequency tracking technology as claimed in claim 1, wherein: the main power converter (10) is of a half-bridge topology structure, and adopts SG2525 as a main control unit to realize output and tracking of PWM control signals.

5. The IGBT half-bridge inverter power supply adopting the frequency tracking technology as claimed in claim 1, wherein: the output of the multi-path direct current power supply is +15V, -15V, +5V and 3.3V respectively.

6. The IGBT half-bridge inverter power supply adopting the frequency tracking technology as claimed in claim 1, wherein: the two IGBT driving ICs are VLA 502-01R.